fix for JSON in v3 output buffering

flight/Engine.php

@@ -742,8 +742,10 @@ class Engine
         $this->response()
             ->status($code)
             ->header('Content-Type', 'application/json; charset=' . $charset)
-            ->write($json)
+            ->write($json);
-            ->send();
+		if($this->response()->v2_output_buffering === true) {
+			$this->response()->send();
+		}
     }
 
     /**

tests/server/LayoutMiddleware.php

@@ -72,6 +72,9 @@ class LayoutMiddleware
 <li><a href="/postpage">404 Not Found</a></li>
 <li><a href="{$final_route}">Mega group</a></li>
 <li><a href="/error">Error</a></li>
+<li><a href="/json">JSON</a></li>
+<li><a href="/halt">Halt</a></li>
+<li><a href="/redirect">Redirect</a></li>
 </ul>
 HTML;
         echo '<div id="container">';

tests/server/index.php

@@ -23,6 +23,9 @@ Flight::group('', function () {
     // Test 1: Root route
     Flight::route('/', function () {
         echo '<span id="infotext">Route text:</span> Root route works!';
+		if(Flight::request()->query->redirected) {
+			echo '<br>Redirected from /redirect route successfully!';
+		}
     });
     Flight::route('/querytestpath', function () {
         echo '<span id="infotext">Route text:</span> This ir query route<br>';
@@ -95,8 +98,25 @@ Flight::group('', function () {
     Flight::route('/error', function () {
         trigger_error('This is a successful error');
     });
+
+	// Test 10: Halt
+	Flight::route('/halt', function() {
+		Flight::halt(400, 'Halt worked successfully');
+	});
+
 }, [ new LayoutMiddleware() ]);
 
+// Test 9: JSON output
+Flight::route('/json', function() {
+	Flight::json(['message' => 'JSON renders successfully!']);
+});
+
+
+// Test 11: Redirect
+Flight::route('/redirect', function() {
+	Flight::redirect('/?redirected=1');
+});
+
 Flight::map('error', function (Throwable $e) {
     echo sprintf(
         '<h1>500 Internal Server Error</h1>' .